Proposes a X chart with variable sample size and variable sampling intervals (VSS-VSI - X chart) which uses dynamic information available from the process to make the control scheme productive.

• 本文从发挥质量管理人员主观能动性出发,讨论动态调整抽样间隔及抽样样本大小对加工过程工序质量监控的思想。介绍了一种同时变化抽样间隔及抽样样本容量的(VSS-VSI-(?